How to invert B&W texture in nodes?
- Thread starter pegot
- Start date
Joel
0
Step Node
There are many nodes, mostly math, that I don't understand, but the Step node seems to be a handy one for simpler tweaks that make sense just by looking at the results. In particular, it can do a lot of things with gray scale values. Worth some experimentation.
There are many nodes, mostly math, that I don't understand, but the Step node seems to be a handy one for simpler tweaks that make sense just by looking at the results. In particular, it can do a lot of things with gray scale values. Worth some experimentation.
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One way is to use the subtract node:
Set the A input to 1,0,0 and plug the image output into B.
This Method inverts values <0 and >1 properly.
B/W is one channel only and you need only the first of three and can use the value output.
Or you take a gradient node and swap the colors (white to black and vice versa).
This will clip the source to the 0 to 1 range and also turn colored input into b/w by taking the first (red) channel.
Also you can insert another slider in the middle and then adjust the brightness.
Set the A input to 1,0,0 and plug the image output into B.
This Method inverts values <0 and >1 properly.
B/W is one channel only and you need only the first of three and can use the value output.
Or you take a gradient node and swap the colors (white to black and vice versa).
This will clip the source to the 0 to 1 range and also turn colored input into b/w by taking the first (red) channel.
Also you can insert another slider in the middle and then adjust the brightness.
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pegot
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Yes that one worked well because by reducing the value of A to a little under 1, I was able to adjust the intensity of the reflection. Thanks!
In this case I would use the gradient and set the white slider to 95 instead of 100 f.i.
Because when you lower the first term of the subtract node, you will get negative blacks (the whole range gets shifted down: 1->0.95 ; 0 -> -0.05).
pegot
0
Just tried Gradient node too. Adjusting the middle slider limited where in my mask the effect occurred but it did not reduce its intensity. The areas of reflectivity looked too much like grey metal. Actually the Subtract node with reduced "A" value gave me more of what I wanted. It made the reflective areas less grey and more white.
Ok, what works, works :tongue:
I'm just cautious from experience about negative values, they can cause all kinds of weirdness in the course of further node refinement, therefore range awareness is paramount imho.
I'm just cautious from experience about negative values, they can cause all kinds of weirdness in the course of further node refinement, therefore range awareness is paramount imho.